Road grader



May 27, 1941. J. H. KERBER ROAD. @BADER Filed Dec. 2o, 1940V 5Sheets-Sheet l '/INVENTOR BY l ATTORNEY May 27, E941. .L1-i. KERBER ROADGRADER Filed Dec. 20, 1940 5 Sheets-Sheet 2 INVENToR A 'K Wf/(MW 'BY .A

'j ATTORNEY ay- 2'?, NM..

J. H. KERBER ROAD GRADER Filed DB6. 20, 1940 3 Shets-Sheei 5 mm M @w M mNw I m I @mi w@ .1., ...M .W s P .W r 1.---11 -:T: La m wm mm mm u fVzh... 5/ lll il wv J Q mm. .N.\ I om om mm m um mm mw o l wm um .mm njf 1 uit t ,/,l la-.. 7 l S w m om ...l I mm O d r MW mm M 1| n Nm mm Nq1| Patented May 27, 1941 UNITED STATES` PATENT OFFICE (Cl.l 37-159) 5Claims.

The invention relates to road graders.

The general object of the invention is to provide a road-treating bladeattachment that may be readily applied to an industrial truck, so thatsuch truck can be used for road patrol work and provide the motive powerfor operating the scraper blade, and thus save the expense of a specialtractor grader. More particularly, the invention is designed to simplifyand improve the road grader shown and described in my co-pendingapplication Serial No. 272,491, filed May 8, 1939, for Truck grader, andin this connection the mounting of the blade from the truck frame hasbeen simplified, and the height of the blade is directly controlled by apair of independently operable hydraulic cylinders which may be directlyconnected to the blade or indirectly through shoes having a leverconnection with the blade.

The invention further consists in the several features hereinafter setforth and more particularly defined by claims at the conclusion hereof.

In the drawings:

Fig` 1 is a side elevation View of a grader structure embodying theinvention;

Fig. 2 is a plan view of the improved grader structure, parts beingbroken away and parts being shown in section;

Fig 3 is a detailed sectional View taken on the line 3 3 of Fig. 2;

Fig. 4 is a detailed sectional view taken on the broken line 4--4 ofFig. 3;

Fig. 5 is a diagrammatic View of parallel mold board adjustments;

Fig. 6 is a view similar to Fig. 5 showing angular mold boardadjustments.

Referring to the drawings, I have shown the device embodying theinvention applied to a motor driven truck 8 of conventional form andhaving a dump body 9 and provided with an hydraulic pump I furnishinghydraulicV fluid from a supply tank I0' and under suitable pressure to asystem' including a control valve mechanism Il mounted adjacent thetruck operators seat I2, so that the operating handles I2 for said valvemechanism are within easy reach of the driver of the vehicle.

The scraper blade or mold board I3 is connected to a carrying frame I4which at its center is connected through a ball and socket swivel jointI to an angular push frame I6, the legs of which at their base end areeach, respectively, pivotally connected at I'I to a bracket I8 which isclamped by U-bolts I9 to the rear axle housing of the truck at a pointoutside the side frames gof said plates.

2| of said truck. vThe blade is vertically angularly adjustablymountedon the frame I4 by ears 22 at its lower part connected to said member bypins 23 `and by ears 24 at its upper part connected by bolts 25 to links26 which in turn are adjustably connected to the frame I4 by brackets 27which at their upper ends are pivotally connected by bolts 28 that areadapted to engage in any one of a series of holes 29 in the links 26,the blade being shown in uil in Fig. 4 in one angular position and beingshown in dotted in said gure in another position. The frame is hung fromthe truck frame as hereinafter described.

Transversely extending frame members 33 are secured in spaced relationto the side bars 2| of the truck by U-bolts 3l. Vertically disposedangled brackets 32 are secured by bolts 32 to the front faces of theside bars adjacent the ends ofy the frame members 30 and are providedwith a plurality of vertically spaced holes, one of which is adapted totake one of the bolts 33 which also passes through the extended end ofthe member 30. Arcuate supporting members 34 arer vertically adjustablyconnected to the brackets 32 by bracket parts 35 adjustably connected tothe brackets 3-2 by the bolts 33 adapted for insertion in holes 36 insaid bracket parts and selected holes in the brackets 32, one of thebolts 33 as noted above also extending through a hole in the framemember 30. The members 34 are on a radius which forms a turntablemounting for the blade.

Hoist cylinder and guide mounting brackets 3l are adjustably guided onthe .arcuate members 34 by arcuately grooved plates 38 clamped to saidYbrackets 31 by bolts 39 and a series of shims 33 which are individuallyremovable for the purpose of taking up wear of grooved portions Thus thebrackets 3l are free to slide along the turntable parts 34, and theyhave a guide bar 49 extending vertically through them, and their 'arms42 carry a pivot pin 42 which passes through a pivot boss formed on thetop of the hoist cylinder 43. Each guide bar 4I) is pivotally connectedat its lower end to the framel I4 so as to permit said frame and moldboard to swing in a vertical plane thereto by a pivot pin 44 mounted inspaced ears 45 on the frame I4, said pin being removably held in saidears by a removable cotter pin 46.

Elach hoist cylinder 43 is a double acting type cylinder with the piston4l'V working therein having a rod 48 working through the usual -stuiiingbox (not shown) in the lower end of said cylinder, the lower outer endof said rod being operatively connected by a pivot pin 49 to one end ofa lever 50 which is pivotally mounted intermediate its ends on pivot pin5I carried by a boss 52 on the frame I4. The lever 50 is formed by apair of spaced members which straddle the rod 48 and the boss 52 but areconnected together at their other end to provide a laterally extendingapertured -portion .53 through which a threaded stud 54 vloosely passes,said stud being secured in different positions of vertical adjustmentrelative to the lever 55 by nuts 55 vertically adjustably mountedonfsaid stud. The stud is vertically pivotally connected at its lowerend 56 to a metal shoe i51 'which is provided with vertically mountedguide pins I'58 that are loosely mounted in guide bosses 59 in the frameI4.

With the above construction naising of the piston 41 by hydraulic fluidintroduced into the cylinder 43 on the lower side thereof causes it 1toYswing the inner end of the lever 50 connected Fig. 5, or Vone end ofthe blade may be lowered while the other is raised as shown diagrammati-`cally in Fig. 6. From the above it will be noted that the shoes 51 actas depth gauges for the blade. Where the gauging action of the shoes 51-is not desired, they may be held in an inoperative position by lockingpins 60 that are inserted through holes 6I in the levers 50 and analigned hole in bosses` 62 on the frame I4.

It will be noted that the loose connections between the frame I4 and theshoes 51 and the pivotal connectio-ns of the guide bars 40 With theframe I4 and the pivotalv connections of the cylinders 43 permit-linclination of one end of the mold board I3 relative to the-other.

so as to allow the brackets 31 and plates 38 to turn freely relative tothe turntable mounted on the truck frame.

It will be noted from Fig. 2 that the shoes 51 are located immediatelyback of the mold board I3 and extend lengthwise thereof and have rela.-tively flat bottoms adapted to slide along the top of the roadway.

I desire it to be understood that -this invention is not to belirnited'to any particular form or arrangement of parts except in so faras such limitations are included in the claims.

What I claim as my invention is: 1. The combination with a motor drivenve- :hicle provided with a turntable, of a scraper blade,-means forhanging said scraper blade from -saidvehicle for vertical and horizontalangular movement -relative thereto including hydraulic hoist cylindersmounted for angular movement onvdiametrically opposite sides of saidturntable and provided with pistons, levers pivot-allycarried by `saidscraper blade intermediate their ends andoperatively connected at oneend to saidpistons, and` road engaging shoesoperative- 1y connected toythe other `end of said levers whereby vertical .adjustment of saidpistons will act on the .shoes to vary the vertical .position of .saidblade relative to the roadway.

`2. .The combination with a motor driven .vehicle provided with aturntable, of a scraper blade, means for hanging said scraper blade fromsaid vehicle for vertical and horizontal angular For swinging the moldboard angularly in a 50 -lgenerally horizontal plane about its pivotnI5, .an hydraulic cylinder 63 carried by the frame I6 and pivotallyconnected at-64 thereto has a piston 65 working in said cylinder withits rod .56 working through a stuffing box .in said cylinder andpivotally connected .to thefframe I4 by a vertically disposed pivot pin51. With this .construction introduction of hydraulic iluid into .thehead end of the cylinder and relief of fluid from the other end causesthe mold board to 60 Vbe swung from its dotted toy the full lineposition shown in Fig. 2, and of course, by checking the flow of fluidthe piston- E5 may bestopped inany intermediate position so as to .varythe .angular position of the mold board to any. position Within the twoextremes shown, and reversal of the vposition of said blade from itsfullto dottedline position is alected by the introduction of hydraulic iluidat the back of the piston 65 and relief of hydraulic uid from the fron-tend of movement relative thereto .including hydraulic vhoist cylindersmounted for angular movement on diametrically opposite sides of saidturntable and provided with .pistonslevers pivotally carried by saidscraper blade` intermediatetheir ends and operatively connectedat oneend to said pistons, road engaging shoes .operatively connected to theother end .of saidlevers whereby vertical adjustment of said pistonswill act on the shoes to vary the vertical vposition of said bladerelative to the roadway, and manually .openated means for locking saidleversV to said blade with the shoes in Ya retracted position.

3. The combination with a motor driven .vehicle vprovided with aturntable, of a scraper brade, brackets slidably mounted relative tosaid turntable and adapted to beV clamped thereto in different positionsof angular adjustmentrelative to the line of draft of the vehicle,hydraulic hoist cylinders pivotally carried by said brackets and havingpistons voperatively .connected tosaid blade to control the vertical,adjustmentthereo and guide means also Aextending between V.said bladeand brackets and vertically, slidably mounted in the latter.

4. The combination witha motordriven vehicle provided with a turntable,.of .a scraper blade, brackets slidably mounted relative to -saidturntable `andadapted .tombe clamped thereto in 'different `positions ofangular .adjustment reliative to theline .of draft of .the vehicle,hydraulic hoistI cylinderspivotally carriedV by said. brackets andAhaving pistons, road-engagingA Shoes, .levers carried by said bladeA andoperatively connect- .ametrically-disposedibrackets having clampingplates slidably mountedpn said rails and clamping bolts for saidplatesiifor securing said brackets in the desired radial angle positionrelative to said turntable, a grader blade, an hydraulic hoist cylinderpivo-tally-hung from each bracket and hlaving a. piston operativelyconnected to said blade to control the vertical adjustment thereof,guide bars pivotally connected to said blade and vertically slidablymounted in said brackets, a push frame operatively connected to l0JOSEPH H. KERBER.

